If there be a third revolution (i.e. after the psychoanalytic and behavioristic), it is in the development of a general theory.
Grinker, Helen MacGill Hughes (ed.) (1967) Towards a Unified Theory of Human Behaviour. 2e ed. New York, Basic Books. p. ix; cited in: Ludwig von Bertalanffy (1968) General System Theory. p. 7
Quotes about the future
page 31

As quoted in Futurism, ed. Didier Ottinger; Centre Pompidou / 5 Continents Editions, Milan, 2008, p. 132.
1910, Manifesto of Futurist Painters,' April 1910
Source: Towards a Better Life (1966), p. 8
Source: address to the Empire Club and the Royal Commonwealth Society, June 26, 1996
Ill Fares the Land (2010), Conclusion: What Is Living and What Is Dead in Social Democracy?

1998 Chairman's Letter http://www.berkshirehathaway.com/letters/1998pdf.pdf
Letters to Shareholders (1957 - 2012)
Khursheed Kamal Aziz The Murder of History, critique of history textbooks used in Pakistan, 1993

“For a person who lives 100 years in the future, the present comes as no surprise.”
Callum Coats: Water Wizard

Speech at Hall of Science c.1880 quoted in An Autobiography of Annie Besant; reported in Edmund Fuller, Thesaurus of Quotations (1941), p. 398; reported as unverified in Respectfully Quoted: A Dictionary of Quotations (1989).
Attributed

On the national debate, Speech http://www.nytimes.com/1987/06/10/us/biden-joins-campaign-for-the-presidency.html announcing entry into 1988 presidential race, Wilmington, Delaware (June 10, 1987)
1980s

ALP in 'me-too' policy mess over death penalty
Response to a backlash following statements made by Robert McClelland, days before the fifth anniversary of the 2002 Bali bombings, who said that Labor would campaign internationally to stop executions of terrorists.
2002
Why Libertarian Gary Johnson must be included in debates (August 11, 2016)

Cited in the Future of Society http://leninist.biz/en/1973/FS375/5.3-Main.Historical.Stages.of.the.Communist.Formation

Quote, 1950, in: Fernand Léger - The Later Years, catalogue ed. Nicolas Serota, published by the Trustees of the Whitechapel Art gallery, London, Prestel Verlag, 1988, p. 15
Quotes of Fernand Leger, 1950's

As quoted in The Alternative Leadership 1936-1941 (1996) by Aleander Werth p. 63

Quote in: 'Le Maillet et le Ciseau', (early 1956); as quoted in Zadkine and Van Gogh, ed. Garance Schabert and Ron Dirven (transl. Anne Porcelijn), Vincent van Goghhuis, Zundert & Scriptum Art, Schiedam 2008, p.29
1940 - 1960

"The Legacy of Ratu Sir Kamisese Mara" - Memorial Lecture http://www.flp.org.fj/s030827.htm, Waterfront Hotel, Lautoka, 27 August 2003

1950s, Farewell address to Congress (1951)

Source: On the Completion of the Bunker Hill Monument (1843), p. 107

Book XI, ch. 4 (trans. Pevear and Volokhonsky)
The Brothers Karamazov (1879–1880)

The Law of Mind (1892)

Narayana Murthy shocks with 'Mera Bharat Mahaan' quote, indicates Infosys Ltd on hiring spree, 16k jobs on offer

Julie Barenson, Chapter 26, p. 270
2000s, The Guardian (2003)

American Soldier, written with Chuck Cannon
Song lyrics, Shock'n Y'all (2003)
Words of Wisdom from Buddhist Master Jun Hong Lu, Volume 1 (2016) ISBN 978-0-6482300-1-4

Source: "The Latest Attack on Metaphysics" (1937), p. 148.

On his program to purchase iBook computers for Maine public schools, as quoted in "Maine Students Hit the iBooks" by Katie Dean in WIRED (9 January 2002) https://archive.is/20130630155629/www.wired.com/gadgets/mac/commentary/cultofmac/2002/01/49046
“Isn't it amazing the way the future succeeds in creating an appropriate past?”
"Dash" (p. 146)
Private Lives in the Imperial City (1979)

Source: An Essay on Aristocratic Radicalism (1889), pp. 18-19

Time and Individuality (1940)

Falling Upward: A Spirituality for the Two Halves of Life (2011)

Source: Leading Change, 1996, p. 25; cited in: avid M. Boje, Bernard Burnes, John Hassard (2012), The Routledge Companion to Organizational Change, p. 140

[NewsBank, 'The Science Guy' returns to tackle issues for older audience, Journal Gazette, Mattoon, Illinois, June 8, 2005, Associated Press]

Source: The Divine Milieu (1960), p. 124

“Devotion, fervor, longing! Those are my pillars. We have to be the bridge to the future.”
Hingabe, Inbrunst, Sehnsucht! Das sind meine Pfeiler. Brücke zur Zukunft müssen wir sein.
Michael: a German fate in diary notes (1926)

Und so wünsche ich mir, dass die Bürgerinnen und Bürger Europas in 50 Jahren sagen werden: Damals, in Berlin, da hat das vereinte Europa die Weichen richtig gestellt. Damals, in Berlin, da hat die Europäische Union den richtigen Weg in eine gute Zukunft eingeschlagen. Sie hat anschließend ihre Grundlagen erneuert, um nach innen, auf diesem alten Kontinent, wie nach außen, in dieser einen großen-kleinen Welt, einen Beitrag zu leisten.
Speech at the 50th anniversary of the signing of the Treaties of Rome on March 25, 2007
2007

This Business of Living (1935-1950)

Morarji Desai speaks about life and celibacy

Why our future depends on libraries, reading and daydreaming (2013)

Source: Quarterly Review, 127, 1869, p. 560

"Hindu Nationalists of Modern India" by Jose Kuruvachira, p. 20

“The future… seems to me no unified dream but a mince pie, long in the baking, never quite done.”
Widely attributed to Edward Young, but in fact written by E. B. White in Harper's Magazine (December 1940), and reprinted in his One Man's Meat (1942).
Misattributed

Source: Legal foundations of capitalism. 1924, p. 25

“Any future which is not beautiful is unacceptable.”

"On the Past and Future"
Table Talk: Essays On Men And Manners http://www.blupete.com/Literature/Essays/TableHazIV.htm (1821-1822)

Jim Rogers Octafinance Interview http://www.octafinance.com/jim-rogers-on-why-you-must-understand-china-and-what-after-north-and-south-korea-unite/27277/

Opening address to the Leadership Fiji 2006 program, 9 March 2006.

Re: Stalin is not a cool name for software http://groups.google.com/group/comp.lang.lisp/msg/428b1f0fb729d6c7 (Usenet article).
Usenet articles, Miscellaneous

1990s, Our March to Freedom is Irreversible (1990)

As quoted in "Angie Davidson Interviews Elaine Paige" by Angie Davidson in lupus.org.uk (2005)

The "enemy within" speech during the 1970 general election campaign; speech to the Turves Green Girls School, Northfield, Birmingham (13 June 1970), from Still to Decide (Eliot Right Way Books, 1972), pp. 36-37.
1970s

2010s, 2010, First speech as UK Prime Minister (2010)

F*** You! Mr. President: Confessions of the Father of the Neutron Bomb (2006)
Source: Horace's Compromise: The Dilemma of the American High School (1984), p. 95.

TV Guide (27 December – 2 January 2004), and Foreword to Fray

Speech http://hansard.millbanksystems.com/commons/1986/nov/06/economic-policy in the House of Commons (6 November 1986)
1980s

“Because free peoples believe in the future, free peoples will own the future.”
2000s, 2005, Address to the National Endowment for Democracy (October 2005)

Source: Dictionary of Burning Words of Brilliant Writers (1895), p. 130.

Source: [Will The Real Alberta Please Stand Up, University of Alberta Press, 2010, 312, Geo Takach]

1960s, Inaugural address (1965)

Apple Needs to Reinvent Itself. It Just Might Be Doing So. http://nytimes.com/2017/06/06/technology/apple-reinvent-itself.html in The New York Times (6 June 2017)
From Interviews

Chen Liang-gee (2017) cited in " INTERVIEW: Minister says role is to be ‘trailblazer’ for technology http://www.taipeitimes.com/News/taiwan/archives/2017/04/03/2003667988/3" on Taipei Times, 3 April 2017

The Plot: The Secret Story of the Protocols of the Elders of Zion (10/2/2005)

A Generational Challenge to Repower America http://www.huffingtonpost.com/al-gore/a-generational-challenge_b_113359.html speech, July 17, 2008.

Testimony before the U.S. House of Representatives Committee on Banking, Finance and Urban Affairs. http://3197d6d14b5f19f2f440-5e13d29c4c016cf96cbbfd197c579b45.r81.cf1.rackcdn.com/collection/papers/1990/1994_0623_RotbergTestimony.pdf, 23 June 1994

The Plan of Delano (1965)

Quote in a letter to 'The World', London 22 Mai, 1878; as cited in Letters of the great artists – from Blake to Pollock, Richard Friedenthal, Thames and Hudson, London, 1963, p. 186
1870 - 1903

Journal of Discourses 18:171-172 (March 26, 1876).
Apostacy

Speech delivered outside outside 10 Downing Street, announcing that he would resign as prime minister after British voters chose to leave the European Union in a referendum (June 24, 2016), see David Cameron's resignation speech in full http://www.cnn.com/2016/06/24/europe/david-cameron-full-resignation-speech/ (published by CNN)
2010s, 2016

For My Legionaries: The Iron Guard (1936), Politics
"George Orwell, Artist" (1972), p. 46
The Good Word & Other Words (1978)

Choice
The Note-Books of Samuel Butler (1912), Part XX - First Principles
The Roots of Anticapitalism

The World's Last Night (1952)
Radio broadcast, 24 April 1987 (excerpts)

What Made America Famous?
Song lyrics, Verities & Balderdash (1974)

Source: Quality, Productivity and Competitive Position, (1982), p. i; Preface

“This election is going to say a lot about Virginia's future and about the country's future.”
Quoted on BBC News, "Virginia governor race: McAuliffe and Cuccinelli campaign on election eve" http://www.bbc.co.uk/news/world-us-canada-24809097, November 4, 2013.

"It's Time For A New Narrative; It's Time For 'Big History'", in 13.7: Cosmos & Culture (10 February 2011) http://www.npr.org/blogs/13.7/2011/02/10/133652898/its-time-for-a-new-narrative-its-time-for-big-history

Rupert on Marriage Equality http://www.youtube.com/watch?v=Uv2Pry_3eFA, YouTube

The Three Brothers from The London Literary Gazette (20th June 1829) as Fame : An Apologue
The Vow of the Peacock (1835)

Stresemann to diplomat Sir Albert Bruce Lockhart in 1928
1920s

Source: Reason and Hope: Selections from the Jewish Writings of Hermann Cohen (1971), p. 124

The Making of an Elder Culture (2009)

“The past, the present,
And the future,
Are all side by side,
Hand in hand”
Song lyrics